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Submission #783632

# Submission time Handle Problem Language Result Execution time Memory
783632 2023-07-15T06:52:48 Z raysh07 Hacker (BOI15_hac) C++17
100 / 100
 234 ms 37956 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18
#define f first
#define s second

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

void Solve()
{
	int n; cin >> n;
	vector <int> a(2 * n + 1);
	int tot = 0;
	for (int i = 1; i <= n; i++){
		cin >> a[i];
		tot += a[i];
		a[i + n] = a[i];
	}

	vector <int> p(2 * n + 1, 0);
	for (int i = 1; i <= 2 * n; i++){
		p[i] = p[i - 1] + a[i];
	}

	vector <int> v(2 * n + 1, 0);
	int x = (n / 2);
	for (int i = 1; i <= 2 * n; i++){
		if (i + x > 2 * n) continue;

		v[i] = p[i + x - 1] - p[i - 1];
	}

	int ans = 0;
	int r;

	multiset <int> st;
	for (int i = 2; i <= n; i++){
	    if (i + n / 2 > n + 1) {
	        r = i;
	        break;
	    }
		st.insert(v[i]);
	}

	int l = 2;

	for (int i = 1; i <= n; i++){
		ans = max(ans, tot - *(--st.end()));

		if (i != n){
			st.insert(v[r++]);
			st.erase(st.find(v[l++]));
		}
	}

	cout << ans << "\n";
}

int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;

   // freopen("in",  "r", stdin);
   // freopen("out", "w", stdout);

  //  cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}

Compilation message

hac.cpp: In function 'void Solve()':
hac.cpp:52:19: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |    st.insert(v[r++]);
      |                   ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 324 KB Output is correct
18 Correct 1 ms 340 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 324 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 3 ms 596 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 2 ms 596 KB Output is correct
26 Correct 2 ms 596 KB Output is correct
27 Correct 1 ms 328 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 1 ms 212 KB Output is correct
30 Correct 2 ms 596 KB Output is correct
31 Correct 2 ms 596 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 320 KB Output is correct
3 Correct 2 ms 596 KB Output is correct
4 Correct 26 ms 6356 KB Output is correct
5 Correct 75 ms 15156 KB Output is correct
6 Correct 98 ms 19024 KB Output is correct
7 Correct 111 ms 22820 KB Output is correct
8 Correct 229 ms 37704 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 324 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 3 ms 596 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 2 ms 596 KB Output is correct
26 Correct 2 ms 596 KB Output is correct
27 Correct 1 ms 328 KB Output is correct
28 Correct 1 ms 212 KB Output is correct
29 Correct 1 ms 212 KB Output is correct
30 Correct 2 ms 596 KB Output is correct
31 Correct 2 ms 596 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 1 ms 320 KB Output is correct
34 Correct 2 ms 596 KB Output is correct
35 Correct 26 ms 6356 KB Output is correct
36 Correct 75 ms 15156 KB Output is correct
37 Correct 98 ms 19024 KB Output is correct
38 Correct 111 ms 22820 KB Output is correct
39 Correct 229 ms 37704 KB Output is correct
40 Correct 3 ms 980 KB Output is correct
41 Correct 6 ms 1748 KB Output is correct
42 Correct 11 ms 2504 KB Output is correct
43 Correct 96 ms 15284 KB Output is correct
44 Correct 212 ms 37704 KB Output is correct
45 Correct 33 ms 7636 KB Output is correct
46 Correct 119 ms 22672 KB Output is correct
47 Correct 234 ms 37836 KB Output is correct
48 Correct 176 ms 37956 KB Output is correct
49 Correct 162 ms 37140 KB Output is correct
50 Correct 164 ms 37072 KB Output is correct